Somehow, with the millions of dollars poured into every episode and the hundreds of eyes working on this huge production, someone left a modern-day takeaway coffee cup in the scene. And no one spotted it. Oops.
And no one spotted it again during the post-production process either. Not the editors or the colourists or the person who uploaded the episode to HBO's servers. Double oops.
You know who did spot it? Those eagle-eyed people on Reddit, where it was posted by "u/ttek".
To be fair to Emilia Clark, we all know the Game of Thrones filming schedule was brutal for the actors with really long, cold days the norm.
HBO responded to the gaffe in good spirits, saying in a press release that, "The latte that appeared in the episode was a mistake... Daenerys had ordered an herbal tea."
Game of Thrones is hardly the first historical period production to feature an anachronism.
Gladiator had a chariot powered by a gas cylinder (visible when it flipped over) while you can see a car in the background of a shot in Braveheart.
